please explain how you answer this question on this practice test

(10 marks) For a biology project, a student measures the tail length (in centimeters) of each of 100 mice of the same variety. Give short answers to the following questions (answers must be clear and concise). 50 48 46 44 42 40 Count 1 2 3 4 5 Tail Length (cm) a. What proportion of mice had a tail length of at least 4 centimeters